28090066 has 4 divisors (see below), whose sum is σ = 42135102. Its totient is φ = 14045032.

The previous prime is 28090039. The next prime is 28090081. The reversal of 28090066 is 66009082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 22896225 + 5193841 = 4785^2 + 2279^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7022515 + ... + 7022518.

Almost surely, 2^28090066 is an apocalyptic number.

28090066 is a deficient number, since it is larger than the sum of its proper divisors (14045036).

28090066 is a wasteful number, since it uses less digits than its factorization.

28090066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14045035.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 28090066 is about 5300.0062264114. The cubic root of 28090066 is about 303.9841361182.

The spelling of 28090066 in words is "twenty-eight million, ninety thousand, sixty-six".